What exact version of After Effects? Include the minor version number---e.g., After Effects CC (12.2.1) or After Effects CS6 (11.0.4). Do not just say "After Effects with the latest updates" or "After Effects CC"; give the specific version number.

What operating system? This should include specific minor version numbers, like "Mac OSX v10.6.8"---not just "Mac".

If you are getting error message(s), what is the full text of the error message(s)?

What were you doing when the problem occurred? What is the exact sequence of steps that you are taking?

Has this ever worked before? If this worked before by doesn't work now, what has changed on your computer in the intervening time?

Tell us about your computer hardware. Include CPU type and number of processor cores, amount of RAM installed, GPU, number and sizes of connected monitors, number of disk drives, and how any external drives are connected.

What versions of drivers for your graphics hardware do you have installed (including CUDA driver and driver for display adapter)?

Do you have any third-party I/O hardware (e.g., AJA, Matrox, Blackmagic, MOTU)?

What kind(s) of source footage? When telling about your source footage, tell us about the codecs, not just the container types. For example, "H.264 in a .mov container", not just "QuickTime".

Do you have QuickTime installed. (You should.) If so, what version? The answer should be specific, such as "QuickTime 7.6.2".